Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 2: Scanning probe techniques: Method development I
O 2.7: Talk
Monday, March 12, 2018, 12:00–12:15, MA 004
Analysis of the image contrast on Cu(111) using low temperature atomic force microscopy with CO functionalized tips — •Jalmar Tschakert1, Jannis Jung2, Tobias Schlöder2, Olena Lenchuk2, Doreen Mollenhauer2, Andre Schirmeisen1, and Daniel Ebeling1 — 1Insitute of Applied Physics, Justus-Liebig-University Giessen, Germany — 2Insitute of Physical Chemistry, Justus-Liebig-University Giessen, Germany
Low temperature atomic force microscopy with CO-functionalized tips allows to image surfaces and single adsorbed molecules with atomic resolution. Therefore, this so-called bond imaging technique is particularly interesting for studying on-surface catalytic reactions, since it allows to determine molecular adsorption geometries and specific adsorption sites. However, due to the flexibility of the CO tip and different types of short range interactions between the CO tip and the imaged atoms the resulting image contrast is rather complex. When imaging a flat Cu(111) surface this leads to contrast inversions for certain tip-sample distances, which makes it difficult to unambiguously identify atomic sites. To unravel the mechanism behind the contrast formation on Cu(111) we are performing 3D force-field spectroscopy measurements. Therewith, we are able to determine the lateral movement/tilting of the CO molecule and unambiguously identify different atomic sites.